Cot



Nov. 9, 1937.

W. B. TUCKER COT Filed.Feb. 7, 1935 PM; No 9, 193 2,098,603

UNITED STATES PATENT OFFICE COT William B. Tucker, Lancaster, Pa., assignor to Armstrong Cork Company, Lancaster, Pa., a corporation of Pennsylvania Application February 7, 1935, Serial No. 5,378

10 Claims. (01. 19-443) My invention relates to cots and more particu- Figure 2 is an oblique view of a cot embodying larly to covers in the form of preformed cork commy invention; position cots adapted to be applied to rolls or Figure 3 is a diagrammatic view of a mechaother surfaces to be covered, and preferably held nism commonly employed for applying cots to 5 in position by means of adhesive, although my rolls; and 5 invention is also applicable to cots intended to be Figures 4, 5, 6 and 7 are sectional views illustratheld in place solely by friction. ing modifications of my invention.

Cork composition cots have been used with cn- Figure 1 shows, diagrammatically, a cotton siderable success in the spinning and drawing of spinning roll 2 having arbors 3 and 4 covered with 10 cotton fibers. They are also used as coverings cots 5 and 6 respectively. The cot 6 is of the 10 for typewriter feed rolls, pulleys and the like. In usual type Whereas the cot 5 embodies my invenmany such uses, it is desirable to have a relatively tion. The chain lines 5 and 6' represent the size scft working surface, and, consequently, the cots of the cots prior to application. It will be are more or less compressible along a direction noted that they are identical in size prior to parallel to their axes. application, but that the applied cot 6 is com- 15 Cots are generally secured to the rolls or other pressed to about three-fourths the size of the surfaces which they cover by means of adhesive, cot 5. This compression may be due to a numalthough in some instances they are held in pober of combining conditions. In the first place, sition solely by friction. It is customary to form the rolls are usually provided with a roughthe cots with an inner diameter slightly less than ened surface 1 which serves to hold adhesive the outer diameter of the roll to which it is to be when the cots are adhesively secured and also applied, Say ,64 less for the usual spinning cots, serves to aid in frictionally holding the cots if they and force the roll into the cot, thus placing the be applied without adhesive. The cots are gencot under pressure along a direction parallel to erally made with an inner diameter slightly less its axis. The frictional engagement of the cot than the outer diameter of the arbor as pointed 25 with the roll exerts considerable force on the cot, out above, and in some instances the arbors will v and, as a result, the cot is compressed to a connot be accurately machined. It is not uncommon siderable extent and does not properly cover the to find arbors .008" to .010 oversize. This natroll to which it is applied. The compression of urally increases the friction developed in the apthe cork composition also results in adenser workplication of cots thereto. 30

ing surface which may, in some instances, be ob- In F gure. 3, a cot assem y mechanism jectionable. monly employed in the art is shown with a cot- It is an object of my invention to provide a cot ton spinning roll in position with one cot apin which the density of the body, which may be plied to an arbor thereof and a second cot in cork composition, may be relatively low and the the process of being assembled with the roll. 35 compressibility of the composition, consequently, The mechanism includes a base 8 in which is relatively high, which cot is, nevertheless, relavmounted a spring urged hollow spindle 9 and a tively rigid along a direction parallel to its axis. pressure applying rod l0 mounted in guideways In my preferred embodiment, longitudinal com- II and I2. The rod I0 is movable toward the pression is inhibited by means of a renitent coatspindle 9 and is provided with an operating lever 40 ing applied to at least a portion of a surface of l3 secured to a quadrant l4, connected by a belt the cot lying along a line parallel to the axis of or chain 15 to a collar l6 secured to the rod III; the cot. rotation of the quadrant in a counter-clockwise A further object of my invention is to provide a direction moving the rod l0 toward the spindle 9.

cot having a renitent coating applied to a surface In the application of cots to arbors, an entering 45 thereof which coating may be rendered adhesive thimble I1 is placed over the end of a roll l8 and and serve to secure the cot to a roll or other surthe opposite end of the thimble is entered into face it is to cover. the spindle 9. A cot I9 is placed over the spindle In order that my invention may be more readily 9, the spindle being of substantially lesser diameunderstood, I will describe the same in conjunc ter than the inner diameter of the cot. The end 50 tion with the attached drawing, in whichof the roll opposite to the end upon which the Figure 1 is a side elevation of a cotton spinning cot is to be applied is held in a suitable jaw 20 roll having two cots applied thereto, illustrating in the pressure applying rod Hi. The quadrant the effect of compression of a cot incident to ap- I4 is now rotated in a counter-clockwise direction 50 plication to a roll; and the thimble I1 is urged into the cot. enterguide 22 upon compression of the spindle returning spring. Since the cots are of a compressible nature, particularly in a direction parallel to the axis thereof, they will be compressed to some extent by this assembly operation and, as a result, will not cover the entire arbor. As pointed out above, this compression is partly due to frictional l0 engagement of 'the cot with the arbor and this frictional engagement is materially increased by the roughened surface 2 I.

A cot embodying my invention is illustrated in Figure 2. The cot shown is formed of a body of cork composition 23 having a renitent coating 24 applied to its inner wall. The coating 24 preferably extends over the entire inner surface of and in direct contact with the body, but it may be applied to any portion of the body so long as it serves to rigidify the body along a direction parallel to its axis or in the direction of pressure developed during assembly. The coating is preferably relatively thin, say .003" when dry, and should form a relatively still, unyielding film upon drying or setting. Any coating which serves this purpose will be satisfactory.

I have obtained good results using a .003" coating of water soluble adhesive such as hide o glue. A coating of this type is desirable in that a in the cot prior to any material weakening of the renitent coating by contact with the water on the roll.

In some instances it may be found "desirable to provide a coating which will not be materially affected by moisture. While the use of a water soluble adhesive as the renitent coating will be found advantageous in certain instances, it is not essential that the renitent coating serve this 'purpose. For example, a suitable renitent coat ing might take the'form of a resin dissolved in an appropriate solvent or applied in heated condition. A coating of lacquer will also serve this purpose. The renitent coating may be covered with an adhesivecoating as shown in Figure 4. A body of cork composition 25 has a renitent coating 2', say a resin or lacquer coating, and an adhesive coating 21. In this type of cot, the adhesive may or may not form a renitent coating, since compression along a direction parallel 65 to the axis of the body 25 is limited by the coating 26.

It should be borne in mind while viewing the drawing that the thickness of the coatings is shown to an exaggerated scale for sake of clarity.

60 The thickness of the coating will depend to some extend upon its renitent properties and also upon the density and compressibility of the untreated cot,

When a relatively low density material is em- 65 ployed, it may be found desirable to apply a renitent coating to the outer surface of the cot as well as to the inner surface. In Figure 5, a cork composition cot 28 is shown having a renitent coatlng 29 applied to the'outer surface and 70 a coating 30 applied to the inner surface. The

75 of an outer coating entails, of course, the props lem of removing the applied coating for it is desirable to have the cork composition exposed at the working surface. Cots are generally buffed after application to the roll in order to provide a true, smooth surface, and it is a simple matter to grind the renitent coating during this bufling operation.

In Figure 6 a cot is shown in which the renitent coating is applied in the form of helical strips 3|, 32 and 33 extending along the inner surface of the cot 34 and bonded directly thereto. The strips preferably extend from edge to edge in order to prevent compression and, while they are illustrated as helical strips, they could run parallel to the axis with equally satisfactory results. Any formation of coating may be used provided it serve to inhibit material longitudi a1 compression of the cots upon the application 0 rolls or other surfaces to be covered.

Figure 7 illustrates a further modification of my invention in which the renitent coating is applied only to the outer surface of the cot. The cork composition body is shown at 35 and the coating at 38. As illustrated, the coating may cover the entire outer surface or may be otherwise disposed. The coating 36, as in the embodiment of Figure 5, should be one that may be readily removed by grinding. This type of cot is particularly desirable for use in those places where the cot is held solely by friction. It is obvious, however, that an adhesive may be applied to the inner surface of the cot prior to application and the renitent coating 36 relied upon to prevent material compression along a direction parallel to the axis of the cot.

My invention is obviously of great advantage where relatively soft cork composition coverings are required, say 25 pounds or less in density. In the cotton spinning industry, for example, cots having a relatively soft cork composition working surface are generally employed. Since the resistance of the composition to compression along a direction parallel to the axis of the cot decreases in proportion to the increase in softness of the cork composition and decrease in density, the problem of assembly has become more prominent with the trend toward softer cork composition cots. By my invention the major problem is overcome, and rapid assembly, without material compression and consequent increase in density and hardness of the surface, is obviated.

In the embodiments of my invention shown in the drawing, the body of the cot is composed of cork composition. My invention is applicable to cots having bodies of other material of a compressible character, such for example as rubber bound compositions commonly used for typewriter feed rolls.

In order to determine the renitent qualities of a water soluble gelatine coating applied to the entire inner surface of cork composition cots, a number of samples were obtained from a single batch and some were coated on their inner surface with a layer of hide glue which was approximately .003" thick upon drying. The samples were all of substantially the same density, hole size, length and outside diameter. It was found that, upon the application of 15 pounds pressure along a direction parallel to the axis of the cots for one minute, the uncoated cots compressed about three times as much as those having the renitent coating applied thereto. For example, cots 1%" long having an outer diameter of 1 and a hole size of H" and a density of 27 pounds per cubic foot compressed .157" upon the application of 15 pounds pressure, whereas similar cots embodying the renitent coating compressed but .060" upon the application of 15 pounds pressure.

It is intended by the statement, as used in the claims, that the entire body of the cot is readily compressible axially, to express the fact that the cot, without a renitent coating or coatings, would normally be readily compressible axially, and to thereby distinguish the cots of my invention from those cots which are inherently resistant to axial compressionsuch as fiber interlined cots or multi-ply structures possessing such characteristics.

While my invention has been described particularly in connection with cork composition cots for textile rolls, it will be understood that my invention is applicable to cots for other uses. It is, of course, particularly desirable where the density of the composition is relatively low, but is, nevertheless, applicable to the more dense compositions commonly employed in industry.

While I have described and illustrated the preferred embodiment of my invention, it will be understood that the invention is not so limited but may be otherwise embodied with the scope of the following claims:

I claim: a

1. A cot for covering rolls or the like, the entire body of which is readily compressible axially, comprising a hollow cylindrical body having a resilient working surface and a relatively thin, dried, renitent coating, capable of being rendered adhesive by the application of water thereto, applied directly to substantially the entire exposed inner surface of the body and rendering said cot resistant to axial compression upon application of the cot to a roll.

3. A cot for covering rolls or the like, the entire body of which is readily compressible axially, comprising a hollow cylindrical body of cork composition having a density of twenty-five pounds or less ly, comprising a hollow, cylindrical body of cork composition having a density of twenty-five pounds or less per cubic foot, having a resilient cork composition working surface and a relatively thin, dried renitent coating of gelatineglue, capable of being rendered adhesive by the application of water thereto, applied directly to sub stantially the entire exposed inner surface'of the cork composition body and bonded thereto, said renitent coating constituting the sole means auxiliary to the body to render said cot resistant to axial compression upon application of the cot to a roll.

5. A cot for covering rolls or the like, the entire body of said cot being formed of material of such character that it is compressible axially to an objectionable extent when subjected to frictional forces setup in applying the cot to a roll, comprising a hollow cylindrical body, having a resilient working surface and a dried, renitent coating applied to the body and rendering said cot resistant to such axial compression upon its application to a roll.'

6. A cot in accordance with claim 5 in which the renitent coating is applied to the inner surface of the body and is capable of being rendered adhesive.

'7. A cot in accordance with claim 5 in which the renitent coating is applied to substantially the entire exposed inner surface of the body.

8. A cot in accordance with claim 5' in which the entire body is formed of cork composition and in which the renitent coating is applied to substantially the entire exposed inner surface thereof.

9. A cot in accordance with claim 5 in which the renitent coating is applied to the inner surface of the body and in which a dried coating of adhesive is disposed over a portion at least of the renitent coating.

10. A cot in accordance with claim 5 in which the renitent coating is applied to the outer surface of the body.

WILLIAM B. TUCKER. 

